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When attempting to use RubyProf RPCs time out and this causes ripple on failures. #22

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josephglanville opened this issue Sep 30, 2013 · 4 comments
Open

When attempting to use RubyProf RPCs time out and this causes ripple on failures. #22

josephglanville opened this issue Sep 30, 2013 · 4 comments

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@josephglanville
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E, [2013-09-30T04:07:52.989930 #80319] ERROR -- : Actor crashed!
NoMethodError: undefined method `-' for nil:NilClass
    /Users/jpg/src/floss/lib/floss/log_replicator.rb:98:in `replicate'
    /Users/jpg/src/floss/lib/floss/log_replicator.rb:58:in `block (2 levels) in initialize'
    /Users/jpg/.rvm/gems/ruby-1.9.3-p448/bundler/gems/celluloid-11fe1990fd6e/lib/celluloid/actor.rb:398:in `block in task'
    /Users/jpg/.rvm/gems/ruby-1.9.3-p448/bundler/gems/celluloid-11fe1990fd6e/lib/celluloid/tasks.rb:55:in `block in initialize'
    /Users/jpg/.rvm/gems/ruby-1.9.3-p448/bundler/gems/celluloid-11fe1990fd6e/lib/celluloid/tasks/task_fiber.rb:13:in `block in create'

I am not sure what is causing this yet but I saw it during testing.
@aflatter
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This happens if the log is empty and the first append_entries rpc fails. In that case, @write_indices[peer] should not be decremented, but the real question is: Why does that peer fail?

@josephglanville
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I managed to produce a worse crash when I invoke it via the ruby-prof command line.

ruby-prof examples/distributed_hash.rb

Produces the following stacktrace.

/Users/jpg/.rvm/gems/ruby-1.9.3-p448/gems/ruby-prof-0.13.0/bin/ruby-prof:302: [BUG] Segmentation fault
ruby 1.9.3p448 (2013-06-27 revision 41675) [x86_64-darwin12.5.0]

-- Control frame information -----------------------------------------------
c:0003 p:0029 s:0010 b:0009 l:001020 d:000008 BLOCK  /Users/jpg/.rvm/gems/ruby-1.9.3-p448/gems/ruby-prof-0.13.0/bin/ruby-prof:302
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:002178 d:002178 TOP

-- Ruby level backtrace information ----------------------------------------
/Users/jpg/.rvm/gems/ruby-1.9.3-p448/gems/ruby-prof-0.13.0/bin/ruby-prof:302:in `block in <top (required)>'

-- C level backtrace information -------------------------------------------

   See Crash Report log file under ~/Library/Logs/CrashReporter or
   /Library/Logs/CrashReporter, for the more detail of.

-- Other runtime information -----------------------------------------------

* Loaded script: /Users/jpg/.rvm/gems/ruby-1.9.3-p448/bin/ruby-prof

* Loaded features:

    0 enumerator.so
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    3 /Users/jpg/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/x86_64-darwin12.5.0/rbconfig.rb
    4 /Users/jpg/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/site_ruby/1.9.1/rubygems/compatibility.rb
    5 /Users/jpg/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/site_ruby/1.9.1/rubygems/defaults.rb
    6 /Users/jpg/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/site_ruby/1.9.1/rubygems/deprecate.rb
    7 /Users/jpg/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/site_ruby/1.9.1/rubygems/errors.rb
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   10 /Users/jpg/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/site_ruby/1.9.1/rubygems/platform.rb
   11 /Users/jpg/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/site_ruby/1.9.1/rubygems/basic_specification.rb
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[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

[1]    80817 abort      ruby-prof examples/distributed_hash.rb

@tarcieri
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@josephglanville that's likely an MRI bug. Can you try 2.0.0?

@aflatter
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You original issue should be solved by b20f384.

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